Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

A vast city of the dead, where the deceased outnumber the living by more than a million.

Two pillars set 10 paces apart commemorate the "last notable American duel."

A promotional sun clock on the site of San Francisco's great raceway.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

The final resting place of the Emperor of the United States and Protector of Mexico.

An inconspicuous suburban street corner is the site of San Diego's worst air disaster.